Norwegian LNG-fueled escort tugs opt for Wärtsilä

JANUARY 28, 2015— Wärtsilä has signed a contract to supply three large new escort tugs for Norwegian operator Østensjø Rederi with Wärtsilä dual-fuel (DF) engines integrated with a customized gas storage and supply system also supplied by Wärtsilä. The tugs will primarily burn LNG (Liquefied Natural Gas), but the Wärtsilä DF engines provide the flexibility to select the most suitable fuel according to availability, price and local environmental restrictions.

Designed by naval architect and marine engineering firm Robert Allan Ltd, in close cooperation with Østensjø Rederi, the tugs will have a bollard pull of 100 tons, and will operate at Statoil’s Melkøya terminal near Hammerfest, Norway. Wärtsilä and Østensjø have cooperated closely to develop the chosen LNG solution for these new vessels.

The overall LNG system, which incorporates Wärtsilä’s unique LNGPac fuel system, a fully integrated gas handling system, and the Wärtsilä Gas Valve Unit (GVU), has been specially designed by Wärtsilä to accommodate the need for a compact solution. The tugs will be powered by 6-cylinder Wärtsilä 34DF dual-fuel engines. The Wärtsilä equipment will be delivered during the first half of 2016.

“These are trend setting tugs in that they provide environmental sustainability through the use of LNG fuel. Wärtsilä is the technology leader in making this trend possible. At the same time, the flexibility of the dual-fuel engine technology also ensures a high level of operational security since the switch from gas to diesel can be made at any time without loss of speed or power,” says Carl Johan Amundsen, Project Manager at Østensjø Rederi.

Østensjø Rederi is a leading provider of offshore services and operates a fleet of 28 modern vessels. The company’s tugboats currently operate at four terminals located in Norway, England and Ireland. The group has offices in Norway, the UK, Ireland and Malta.